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RtMidi.cpp
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/**********************************************************************/
/*! \class RtMidi
\brief An abstract base class for realtime MIDI input/output.
This class implements some common functionality for the realtime
MIDI input/output subclasses RtMidiIn and RtMidiOut.
RtMidi WWW site: http://music.mcgill.ca/~gary/rtmidi/
RtMidi: realtime MIDI i/o C++ classes
Copyright (c) 2003-2007 Gary P. Scavone
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation files
(the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software,
and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
Any person wishing to distribute modifications to the Software is
requested to send the modifications to the original developer so that
they can be incorporated into the canonical version.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**********************************************************************/
// RtMidi: Version 1.0.7
#include "RtMidi.h"
#include <sstream>
//*********************************************************************//
// Common RtMidi Definitions
//*********************************************************************//
RtMidi :: RtMidi()
: apiData_( 0 ), connected_( false )
{
}
void RtMidi :: error( RtError::Type type )
{
if (type == RtError::WARNING) {
std::cerr << '\n' << errorString_ << "\n\n";
}
else if (type == RtError::DEBUG_WARNING) {
#if defined(__RTMIDI_DEBUG__)
std::cerr << '\n' << errorString_ << "\n\n";
#endif
}
else {
std::cerr << '\n' << errorString_ << "\n\n";
throw RtError( errorString_, type );
}
}
//*********************************************************************//
// Common RtMidiIn Definitions
//*********************************************************************//
RtMidiIn :: RtMidiIn() : RtMidi()
{
this->initialize();
}
void RtMidiIn :: setCallback( RtMidiCallback callback, void *userData )
{
if ( inputData_.usingCallback ) {
errorString_ = "RtMidiIn::setCallback: a callback function is already set!";
error( RtError::WARNING );
return;
}
if ( !callback ) {
errorString_ = "RtMidiIn::setCallback: callback function value is invalid!";
error( RtError::WARNING );
return;
}
inputData_.userCallback = (void *) callback;
inputData_.userData = userData;
inputData_.usingCallback = true;
}
void RtMidiIn :: cancelCallback()
{
if ( !inputData_.usingCallback ) {
errorString_ = "RtMidiIn::cancelCallback: no callback function was set!";
error( RtError::WARNING );
return;
}
inputData_.userCallback = 0;
inputData_.userData = 0;
inputData_.usingCallback = false;
}
void RtMidiIn :: setQueueSizeLimit( unsigned int queueSize )
{
inputData_.queueLimit = queueSize;
}
void RtMidiIn :: ignoreTypes( bool midiSysex, bool midiTime, bool midiSense )
{
inputData_.ignoreFlags = 0;
if ( midiSysex ) inputData_.ignoreFlags = 0x01;
if ( midiTime ) inputData_.ignoreFlags |= 0x02;
if ( midiSense ) inputData_.ignoreFlags |= 0x04;
}
double RtMidiIn :: getMessage( std::vector<unsigned char> *message )
{
message->clear();
if ( inputData_.usingCallback ) {
errorString_ = "RtMidiIn::getNextMessage: a user callback is currently set for this port.";
error( RtError::WARNING );
return 0.0;
}
if ( inputData_.queue.size() == 0 ) return 0.0;
// Copy queued message to the vector pointer argument and then "pop" it.
std::vector<unsigned char> *bytes = &(inputData_.queue.front().bytes);
message->assign( bytes->begin(), bytes->end() );
double deltaTime = inputData_.queue.front().timeStamp;
inputData_.queue.pop();
return deltaTime;
}
//*********************************************************************//
// Common RtMidiOut Definitions
//*********************************************************************//
RtMidiOut :: RtMidiOut() : RtMidi()
{
this->initialize();
}
//*********************************************************************//
// API: Macintosh OS-X
//*********************************************************************//
// API information found at:
// - http://developer. apple .com/audio/pdf/coreaudio.pdf
#if defined(__MACOSX_CORE__)
// The CoreMIDI API is based on the use of a callback function for
// MIDI input. We convert the system specific time stamps to delta
// time values.
// OS-X CoreMIDI header files.
#include <CoreMIDI/CoreMIDI.h>
#include <CoreAudio/HostTime.h>
// A structure to hold variables related to the CoreMIDI API
// implementation.
struct CoreMidiData {
MIDIClientRef client;
MIDIPortRef port;
MIDIEndpointRef endpoint;
MIDIEndpointRef destinationId;
unsigned long long lastTime;
};
//*********************************************************************//
// API: OS-X
// Class Definitions: RtMidiIn
//*********************************************************************//
void midiInputCallback( const MIDIPacketList *list, void *procRef, void *srcRef )
{
RtMidiIn::RtMidiInData *data = static_cast<RtMidiIn::RtMidiInData *> (procRef);
CoreMidiData *apiData = static_cast<CoreMidiData *> (data->apiData);
bool continueSysex = false;
unsigned char status;
unsigned short nBytes, iByte, size;
unsigned long long time;
RtMidiIn::MidiMessage message;
const MIDIPacket *packet = &list->packet[0];
for ( unsigned int i=0; i<list->numPackets; ++i ) {
// My interpretation of the CoreMIDI documentation: all message
// types, except sysex, are complete within a packet and there may
// be several of them in a single packet. Sysex messages can be
// broken across multiple packets but are bundled alone within a
// packet. I'm assuming that sysex messages, if segmented, must
// be complete within the same MIDIPacketList.
nBytes = packet->length;
if ( nBytes == 0 ) continue;
// Calculate time stamp.
message.timeStamp = 0.0;
if ( data->firstMessage )
data->firstMessage = false;
else {
time = packet->timeStamp;
time -= apiData->lastTime;
time = AudioConvertHostTimeToNanos( time );
message.timeStamp = time * 0.000000001;
}
apiData->lastTime = packet->timeStamp;
iByte = 0;
if ( continueSysex ) {
// We have a continuing, segmented sysex message.
if ( !(data->ignoreFlags & 0x01) ) {
// If we're not ignoring sysex messages, copy the entire packet.
for ( unsigned int j=0; j<nBytes; j++ )
message.bytes.push_back( packet->data[j] );
}
if ( packet->data[nBytes] == 0xF7 ) continueSysex = false;
if ( !continueSysex ) {
// If not a continuing sysex message, invoke the user callback function or queue the message.
if ( data->usingCallback && message.bytes.size() > 0 ) {
RtMidiIn::RtMidiCallback callback = (RtMidiIn::RtMidiCallback) data->userCallback;
callback( message.timeStamp, &message.bytes, data->userData );
}
else {
// As long as we haven't reached our queue size limit, push the message.
if ( data->queueLimit > data->queue.size() )
data->queue.push( message );
else
std::cerr << "\nRtMidiIn: message queue limit reached!!\n\n";
}
message.bytes.clear();
}
}
else {
while ( iByte < nBytes ) {
size = 0;
// We are expecting that the next byte in the packet is a status byte.
status = packet->data[iByte];
if ( !(status & 0x80) ) break;
// Determine the number of bytes in the MIDI message.
if ( status < 0xC0 ) size = 3;
else if ( status < 0xE0 ) size = 2;
else if ( status < 0xF0 ) size = 3;
else if ( status == 0xF0 ) {
// A MIDI sysex
if ( data->ignoreFlags & 0x01 ) {
size = 0;
iByte = nBytes;
}
else size = nBytes - iByte;
if ( packet->data[nBytes] == 0xF7 ) continueSysex = false;
}
else if ( status < 0xF3 ) {
if ( status == 0xF1 && (data->ignoreFlags & 0x02) ) {
// A MIDI time code message and we're ignoring it.
size = 0;
iByte += 3;
}
else size = 3;
}
else if ( status == 0xF3 ) size = 2;
else if ( status == 0xF8 ) {
size = 1;
if ( data->ignoreFlags & 0x02 ) {
// A MIDI timing tick message and we're ignoring it.
size = 0;
iByte += 3;
}
}
else if ( status == 0xFE && (data->ignoreFlags & 0x04) ) {
// A MIDI active sensing message and we're ignoring it.
size = 0;
iByte += 1;
}
else size = 1;
// Copy the MIDI data to our vector.
if ( size ) {
message.bytes.assign( &packet->data[iByte], &packet->data[iByte+size] );
if ( !continueSysex ) {
// If not a continuing sysex message, invoke the user callback function or queue the message.
if ( data->usingCallback ) {
RtMidiIn::RtMidiCallback callback = (RtMidiIn::RtMidiCallback) data->userCallback;
callback( message.timeStamp, &message.bytes, data->userData );
}
else {
// As long as we haven't reached our queue size limit, push the message.
if ( data->queueLimit > data->queue.size() )
data->queue.push( message );
else
std::cerr << "\nRtMidiIn: message queue limit reached!!\n\n";
}
message.bytes.clear();
}
iByte += size;
}
}
}
packet = MIDIPacketNext(packet);
}
}
void RtMidiIn :: initialize( void )
{
// Set up our client.
MIDIClientRef client;
OSStatus result = MIDIClientCreate( CFSTR("RtMidi Input Client"), NULL, NULL, &client );
if ( result != noErr ) {
errorString_ = "RtMidiIn::initialize: error creating OS-X MIDI client object.";
error( RtError::DRIVER_ERROR );
}
// Save our api-specific connection information.
CoreMidiData *data = (CoreMidiData *) new CoreMidiData;
data->client = client;
data->endpoint = 0;
apiData_ = (void *) data;
inputData_.apiData = (void *) data;
}
void RtMidiIn :: openPort( unsigned int portNumber )
{
if ( connected_ ) {
errorString_ = "RtMidiIn::openPort: a valid connection already exists!";
error( RtError::WARNING );
return;
}
unsigned int nSrc = MIDIGetNumberOfSources();
if (nSrc < 1) {
errorString_ = "RtMidiIn::openPort: no MIDI input sources found!";
error( RtError::NO_DEVICES_FOUND );
}
std::ostringstream ost;
if ( portNumber >= nSrc ) {
ost << "RtMidiIn::openPort: the 'portNumber' argument (" << portNumber << ") is invalid.";
errorString_ = ost.str();
error( RtError::INVALID_PARAMETER );
}
MIDIPortRef port;
CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
OSStatus result = MIDIInputPortCreate( data->client, CFSTR("RtMidi MIDI Input Port"), midiInputCallback, (void *)&inputData_, &port );
if ( result != noErr ) {
MIDIClientDispose( data->client );
errorString_ = "RtMidiIn::openPort: error creating OS-X MIDI input port.";
error( RtError::DRIVER_ERROR );
}
// Get the desired input source identifier.
MIDIEndpointRef endpoint = MIDIGetSource( portNumber );
if ( endpoint == NULL ) {
MIDIPortDispose( port );
MIDIClientDispose( data->client );
errorString_ = "RtMidiIn::openPort: error getting MIDI input source reference.";
error( RtError::DRIVER_ERROR );
}
// Make the connection.
result = MIDIPortConnectSource( port, endpoint, NULL );
if ( result != noErr ) {
MIDIPortDispose( port );
MIDIClientDispose( data->client );
errorString_ = "RtMidiIn::openPort: error connecting OS-X MIDI input port.";
error( RtError::DRIVER_ERROR );
}
// Save our api-specific port information.
data->port = port;
connected_ = true;
}
void RtMidiIn :: openVirtualPort( const std::string portName )
{
CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
// Create a virtual MIDI input destination.
MIDIEndpointRef endpoint;
OSStatus result = MIDIDestinationCreate( data->client,
CFStringCreateWithCString( NULL, portName.c_str(), kCFStringEncodingASCII ),
midiInputCallback, (void *)&inputData_, &endpoint );
if ( result != noErr ) {
errorString_ = "RtMidiIn::openVirtualPort: error creating virtual OS-X MIDI destination.";
error( RtError::DRIVER_ERROR );
}
// Save our api-specific connection information.
data->endpoint = endpoint;
}
void RtMidiIn :: closePort( void )
{
if ( connected_ ) {
CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
MIDIPortDispose( data->port );
connected_ = false;
}
}
RtMidiIn :: ~RtMidiIn()
{
// Close a connection if it exists.
closePort();
// Cleanup.
CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
MIDIClientDispose( data->client );
if ( data->endpoint ) MIDIEndpointDispose( data->endpoint );
delete data;
}
unsigned int RtMidiIn :: getPortCount()
{
return MIDIGetNumberOfSources();
}
std::string RtMidiIn :: getPortName( unsigned int portNumber )
{
CFStringRef nameRef;
MIDIEndpointRef portRef;
std::ostringstream ost;
char name[128];
if ( portNumber >= MIDIGetNumberOfSources() ) {
ost << "RtMidiIn::getPortName: the 'portNumber' argument (" << portNumber << ") is invalid.";
errorString_ = ost.str();
error( RtError::INVALID_PARAMETER );
}
portRef = MIDIGetSource( portNumber );
MIDIObjectGetStringProperty( portRef, kMIDIPropertyName, &nameRef );
CFStringGetCString( nameRef, name, sizeof(name), 0);
CFRelease( nameRef );
std::string stringName = name;
return stringName;
}
//*********************************************************************//
// API: OS-X
// Class Definitions: RtMidiOut
//*********************************************************************//
unsigned int RtMidiOut :: getPortCount()
{
return MIDIGetNumberOfDestinations();
}
std::string RtMidiOut :: getPortName( unsigned int portNumber )
{
CFStringRef nameRef;
MIDIEndpointRef portRef;
std::ostringstream ost;
char name[128];
if ( portNumber >= MIDIGetNumberOfDestinations() ) {
ost << "RtMidiOut::getPortName: the 'portNumber' argument (" << portNumber << ") is invalid.";
errorString_ = ost.str();
error( RtError::INVALID_PARAMETER );
}
portRef = MIDIGetDestination( portNumber );
MIDIObjectGetStringProperty( portRef, kMIDIPropertyName, &nameRef );
CFStringGetCString( nameRef, name, sizeof(name), 0);
CFRelease( nameRef );
std::string stringName = name;
return stringName;
}
void RtMidiOut :: initialize( void )
{
// Set up our client.
MIDIClientRef client;
OSStatus result = MIDIClientCreate( CFSTR(""), NULL, NULL, &client );
if ( result != noErr ) {
errorString_ = "RtMidiOut::initialize: error creating OS-X MIDI client object.";
error( RtError::DRIVER_ERROR );
}
// Save our api-specific connection information.
CoreMidiData *data = (CoreMidiData *) new CoreMidiData;
data->client = client;
data->endpoint = 0;
apiData_ = (void *) data;
}
void RtMidiOut :: openPort( unsigned int portNumber )
{
if ( connected_ ) {
errorString_ = "RtMidiOut::openPort: a valid connection already exists!";
error( RtError::WARNING );
return;
}
unsigned int nDest = MIDIGetNumberOfDestinations();
if (nDest < 1) {
errorString_ = "RtMidiOut::openPort: no MIDI output destinations found!";
error( RtError::NO_DEVICES_FOUND );
}
std::ostringstream ost;
if ( portNumber >= nDest ) {
ost << "RtMidiOut::openPort: the 'portNumber' argument (" << portNumber << ") is invalid.";
errorString_ = ost.str();
error( RtError::INVALID_PARAMETER );
}
MIDIPortRef port;
CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
OSStatus result = MIDIOutputPortCreate( data->client, CFSTR("RtMidi Virtual MIDI Output Port"), &port );
if ( result != noErr ) {
MIDIClientDispose( data->client );
errorString_ = "RtMidiOut::openPort: error creating OS-X MIDI output port.";
error( RtError::DRIVER_ERROR );
}
// Get the desired output port identifier.
MIDIEndpointRef destination = MIDIGetDestination( portNumber );
if ( destination == NULL ) {
MIDIPortDispose( port );
MIDIClientDispose( data->client );
errorString_ = "RtMidiOut::openPort: error getting MIDI output destination reference.";
error( RtError::DRIVER_ERROR );
}
// Save our api-specific connection information.
data->port = port;
data->destinationId = destination;
connected_ = true;
}
void RtMidiOut :: closePort( void )
{
if ( connected_ ) {
CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
MIDIPortDispose( data->port );
connected_ = false;
}
}
void RtMidiOut :: openVirtualPort( std::string portName )
{
CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
if ( data->endpoint ) {
errorString_ = "RtMidiOut::openVirtualPort: a virtual output port already exists!";
error( RtError::WARNING );
return;
}
// Create a virtual MIDI output source.
MIDIEndpointRef endpoint;
OSStatus result = MIDISourceCreate( data->client,
CFStringCreateWithCString( NULL, portName.c_str(), kCFStringEncodingASCII ),
&endpoint );
if ( result != noErr ) {
errorString_ = "RtMidiOut::initialize: error creating OS-X virtual MIDI source.";
error( RtError::DRIVER_ERROR );
}
// Save our api-specific connection information.
data->endpoint = endpoint;
}
RtMidiOut :: ~RtMidiOut()
{
// Close a connection if it exists.
closePort();
// Cleanup.
CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
MIDIClientDispose( data->client );
if ( data->endpoint ) MIDIEndpointDispose( data->endpoint );
delete data;
}
void RtMidiOut :: sendMessage( std::vector<unsigned char> *message )
{
unsigned int nBytes = message->size();
// Pad the buffer for extra (unknown) structure data.
Byte buffer[nBytes+32];
MIDIPacketList *pktlist = (MIDIPacketList *) buffer;
MIDIPacket *curPacket = MIDIPacketListInit( pktlist );
MIDITimeStamp timeStamp = 0;
curPacket = MIDIPacketListAdd( pktlist, sizeof(buffer), curPacket, timeStamp, nBytes, &message->at(0) );
CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
// Send to any destinations that may have connected to us.
OSStatus result;
if ( data->endpoint ) {
result = MIDIReceived( data->endpoint, pktlist );
if ( result != noErr ) {
errorString_ = "RtMidiOut::sendMessage: error sending MIDI to virtual destinations.";
error( RtError::WARNING );
}
}
// And send to an explicit destination port if we're connected.
if ( connected_ ) {
result = MIDISend( data->port, data->destinationId, pktlist );
if ( result != noErr ) {
errorString_ = "RtMidiOut::sendMessage: error sending MIDI message to port.";
error( RtError::WARNING );
}
}
}
#endif // __MACOSX_CORE__
//*********************************************************************//
// API: LINUX ALSA SEQUENCER
//*********************************************************************//
// API information found at:
// - http://www.alsa-project.org/documentation.php#Library
#if defined(__LINUX_ALSASEQ__)
// The ALSA Sequencer API is based on the use of a callback function for
// MIDI input.
//
// Thanks to Pedro Lopez-Cabanillas for help with the ALSA sequencer
// time stamps and other assorted fixes!!!
#include <pthread.h>
#include <sys/time.h>
// ALSA header file.
#include <alsa/asoundlib.h>
// A structure to hold variables related to the ALSA API
// implementation.
struct AlsaMidiData {
snd_seq_t *seq;
int vport;
snd_seq_port_subscribe_t *subscription;
snd_midi_event_t *coder;
unsigned int bufferSize;
unsigned char *buffer;
pthread_t thread;
unsigned long long lastTime;
int queue_id; // an input queue is needed to get timestamped events
};
#define PORT_TYPE( pinfo, bits ) ((snd_seq_port_info_get_capability(pinfo) & (bits)) == (bits))
//*********************************************************************//
// API: LINUX ALSA
// Class Definitions: RtMidiIn
//*********************************************************************//
extern "C" void *alsaMidiHandler( void *ptr )
{
RtMidiIn::RtMidiInData *data = static_cast<RtMidiIn::RtMidiInData *> (ptr);
AlsaMidiData *apiData = static_cast<AlsaMidiData *> (data->apiData);
long nBytes;
unsigned long long time, lastTime;
bool continueSysex = false;
RtMidiIn::MidiMessage message;
snd_seq_event_t *ev;
int result;
apiData->bufferSize = 32;
result = snd_midi_event_new( 0, &apiData->coder );
if ( result < 0 ) {
data->doInput = false;
std::cerr << "\nRtMidiIn::alsaMidiHandler: error initializing MIDI event parser!\n\n";
return 0;
}
unsigned char *buffer = (unsigned char *) malloc( apiData->bufferSize );
if ( buffer == NULL ) {
data->doInput = false;
std::cerr << "\nRtMidiIn::alsaMidiHandler: error initializing buffer memory!\n\n";
return 0;
}
snd_midi_event_init( apiData->coder );
snd_midi_event_no_status( apiData->coder, 1 ); // suppress running status messages
while ( data->doInput ) {
if ( snd_seq_event_input_pending( apiData->seq, 1 ) == 0 ) {
// No data pending ... sleep a bit.
usleep( 1000 );
continue;
}
// If here, there should be data.
result = snd_seq_event_input( apiData->seq, &ev );
if ( result == -ENOSPC ) {
std::cerr << "\nRtMidiIn::alsaMidiHandler: MIDI input buffer overrun!\n\n";
continue;
}
else if ( result <= 0 ) {
std::cerr << "RtMidiIn::alsaMidiHandler: unknown MIDI input error!\n";
continue;
}
// This is a bit weird, but we now have to decode an ALSA MIDI
// event (back) into MIDI bytes. We'll ignore non-MIDI types.
message.bytes.clear();
switch ( ev->type ) {
case SND_SEQ_EVENT_PORT_SUBSCRIBED:
#if defined(__RTMIDI_DEBUG__)
std::cout << "RtMidiIn::alsaMidiHandler: port connection made!\n";
#endif
break;
case SND_SEQ_EVENT_PORT_UNSUBSCRIBED:
std::cerr << "RtMidiIn::alsaMidiHandler: port connection has closed!\n";
data->doInput = false;
break;
case SND_SEQ_EVENT_QFRAME: // MIDI time code
if ( data->ignoreFlags & 0x02 ) break;
case SND_SEQ_EVENT_TICK: // MIDI timing tick
if ( data->ignoreFlags & 0x02 ) break;
case SND_SEQ_EVENT_SENSING: // Active sensing
if ( data->ignoreFlags & 0x04 ) break;
case SND_SEQ_EVENT_SYSEX:
if ( (data->ignoreFlags & 0x01) ) break;
if ( ev->data.ext.len > apiData->bufferSize ) {
apiData->bufferSize = ev->data.ext.len;
free( buffer );
buffer = (unsigned char *) malloc( apiData->bufferSize );
if ( buffer == NULL ) {
data->doInput = false;
std::cerr << "\nRtMidiIn::alsaMidiHandler: error resizing buffer memory!\n\n";
break;
}
}
default:
nBytes = snd_midi_event_decode( apiData->coder, buffer, apiData->bufferSize, ev );
if ( nBytes <= 0 ) {
#if defined(__RTMIDI_DEBUG__)
std::cerr << "\nRtMidiIn::alsaMidiHandler: event parsing error or not a MIDI event!\n\n";
#endif
break;
}
// The ALSA sequencer has a maximum buffer size for MIDI sysex
// events of 256 bytes. If a device sends sysex messages larger
// than this, they are segmented into 256 byte chunks. So,
// we'll watch for this and concatenate sysex chunks into a
// single sysex message if necessary.
if ( !continueSysex )
message.bytes.assign( buffer, &buffer[nBytes] );
else
message.bytes.insert( message.bytes.end(), buffer, &buffer[nBytes] );
continueSysex = ( ev->type == SND_SEQ_EVENT_SYSEX && message.bytes.back() != 0xF7 );
if ( continueSysex )
break;
// Calculate the time stamp:
message.timeStamp = 0.0;
// Method 1: Use the system time.
//(void)gettimeofday(&tv, (struct timezone *)NULL);
//time = (tv.tv_sec * 1000000) + tv.tv_usec;
// Method 2: Use the ALSA sequencer event time data.
// (thanks to Pedro Lopez-Cabanillas!).
time = ( ev->time.time.tv_sec * 1000000 ) + ( ev->time.time.tv_nsec/1000 );
lastTime = time;
time -= apiData->lastTime;
apiData->lastTime = lastTime;
if ( data->firstMessage == true )
data->firstMessage = false;
else
message.timeStamp = time * 0.000001;
}
snd_seq_free_event(ev);
if ( message.bytes.size() == 0 ) continue;
if ( data->usingCallback ) {
RtMidiIn::RtMidiCallback callback = (RtMidiIn::RtMidiCallback) data->userCallback;
callback( message.timeStamp, &message.bytes, data->userData );
}
else {
// As long as we haven't reached our queue size limit, push the message.
if ( data->queueLimit > data->queue.size() )
data->queue.push( message );
else
std::cerr << "\nRtMidiIn: message queue limit reached!!\n\n";
}
}
if ( buffer ) free( buffer );
snd_midi_event_free( apiData->coder );
apiData->coder = 0;
return 0;
}
void RtMidiIn :: initialize( void )
{
// Set up the ALSA sequencer client.
snd_seq_t *seq;
int result = snd_seq_open(&seq, "default", SND_SEQ_OPEN_DUPLEX, SND_SEQ_NONBLOCK);
if ( result < 0 ) {
errorString_ = "RtMidiIn::initialize: error creating ALSA sequencer input client object.";
error( RtError::DRIVER_ERROR );
}
// Set client name.
snd_seq_set_client_name(seq, "RtMidi Input Client");
// Save our api-specific connection information.
AlsaMidiData *data = (AlsaMidiData *) new AlsaMidiData;
data->seq = seq;
data->vport = -1;
apiData_ = (void *) data;
inputData_.apiData = (void *) data;
// Create the input queue
data->queue_id = snd_seq_alloc_named_queue(seq, "RtMidi Queue");
// Set arbitrary tempo (mm=100) and resolution (240)
snd_seq_queue_tempo_t *qtempo;
snd_seq_queue_tempo_alloca(&qtempo);
snd_seq_queue_tempo_set_tempo(qtempo, 600000);
snd_seq_queue_tempo_set_ppq(qtempo, 240);
snd_seq_set_queue_tempo(data->seq, data->queue_id, qtempo);
snd_seq_drain_output(data->seq);
}
// This function is used to count or get the pinfo structure for a given port number.
unsigned int portInfo( snd_seq_t *seq, snd_seq_port_info_t *pinfo, unsigned int type, int portNumber )
{
snd_seq_client_info_t *cinfo;
int client;
int count = 0;
snd_seq_client_info_alloca( &cinfo );
snd_seq_client_info_set_client( cinfo, -1 );
while ( snd_seq_query_next_client( seq, cinfo ) >= 0 ) {
client = snd_seq_client_info_get_client( cinfo );
if ( client == 0 ) continue;
// Reset query info
snd_seq_port_info_set_client( pinfo, client );
snd_seq_port_info_set_port( pinfo, -1 );
while ( snd_seq_query_next_port( seq, pinfo ) >= 0 ) {
if ( !PORT_TYPE( pinfo, type ) ) continue;
if ( count == portNumber ) return 1;
count++;
}
}
// If a negative portNumber was used, return the port count.
if ( portNumber < 0 ) return count;
return 0;
}
void RtMidiIn :: openPort( unsigned int portNumber )
{
if ( connected_ ) {
errorString_ = "RtMidiIn::openPort: a valid connection already exists!";
error( RtError::WARNING );
return;
}
unsigned int nSrc = this->getPortCount();
if (nSrc < 1) {
errorString_ = "RtMidiIn::openPort: no MIDI input sources found!";
error( RtError::NO_DEVICES_FOUND );
}
snd_seq_port_info_t *pinfo;
snd_seq_port_info_alloca( &pinfo );
std::ostringstream ost;
AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
if ( portInfo( data->seq, pinfo, SND_SEQ_PORT_CAP_READ|SND_SEQ_PORT_CAP_SUBS_READ, (int) portNumber ) == 0 ) {
ost << "RtMidiIn::openPort: the 'portNumber' argument (" << portNumber << ") is invalid.";
errorString_ = ost.str();
error( RtError::INVALID_PARAMETER );
}
snd_seq_addr_t sender, receiver;
sender.client = snd_seq_port_info_get_client( pinfo );
sender.port = snd_seq_port_info_get_port( pinfo );
receiver.client = snd_seq_client_id( data->seq );
if ( data->vport < 0 ) {
snd_seq_port_info_set_client( pinfo, 0 );
snd_seq_port_info_set_port( pinfo, 0 );
snd_seq_port_info_set_capability( pinfo,
SND_SEQ_PORT_CAP_WRITE |
SND_SEQ_PORT_CAP_SUBS_WRITE );
snd_seq_port_info_set_type( pinfo,
SND_SEQ_PORT_TYPE_MIDI_GENERIC |
SND_SEQ_PORT_TYPE_APPLICATION );
snd_seq_port_info_set_midi_channels(pinfo, 16);
snd_seq_port_info_set_timestamping(pinfo, 1);
snd_seq_port_info_set_timestamp_real(pinfo, 1);
snd_seq_port_info_set_timestamp_queue(pinfo, data->queue_id);
snd_seq_port_info_set_name(pinfo, "RtMidi Input");
data->vport = snd_seq_create_port(data->seq, pinfo);
if ( data->vport < 0 ) {
errorString_ = "RtMidiIn::openPort: ALSA error creating input port.";
error( RtError::DRIVER_ERROR );
}
}
receiver.port = data->vport;
// Make subscription
snd_seq_port_subscribe_malloc( &data->subscription );
snd_seq_port_subscribe_set_sender(data->subscription, &sender);
snd_seq_port_subscribe_set_dest(data->subscription, &receiver);
if ( snd_seq_subscribe_port(data->seq, data->subscription) ) {
errorString_ = "RtMidiIn::openPort: ALSA error making port connection.";
error( RtError::DRIVER_ERROR );
}
if ( inputData_.doInput == false ) {
// Start the input queue
snd_seq_start_queue( data->seq, data->queue_id, NULL );
snd_seq_drain_output( data->seq );
// Start our MIDI input thread.
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
pthread_attr_setschedpolicy(&attr, SCHED_OTHER);
inputData_.doInput = true;
int err = pthread_create(&data->thread, &attr, alsaMidiHandler, &inputData_);
pthread_attr_destroy(&attr);
if (err) {
snd_seq_unsubscribe_port( data->seq, data->subscription );
snd_seq_port_subscribe_free( data->subscription );
inputData_.doInput = false;
errorString_ = "RtMidiIn::openPort: error starting MIDI input thread!";
error( RtError::THREAD_ERROR );
}
}
connected_ = true;
}
void RtMidiIn :: openVirtualPort( std::string portName )
{
AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
if ( data->vport < 0 ) {
snd_seq_port_info_t *pinfo;
snd_seq_port_info_alloca( &pinfo );
snd_seq_port_info_set_capability( pinfo,
SND_SEQ_PORT_CAP_WRITE |
SND_SEQ_PORT_CAP_SUBS_WRITE );
snd_seq_port_info_set_type( pinfo,
SND_SEQ_PORT_TYPE_MIDI_GENERIC |
SND_SEQ_PORT_TYPE_APPLICATION );
snd_seq_port_info_set_midi_channels(pinfo, 16);
snd_seq_port_info_set_timestamping(pinfo, 1);
snd_seq_port_info_set_timestamp_real(pinfo, 1);
snd_seq_port_info_set_timestamp_queue(pinfo, data->queue_id);
snd_seq_port_info_set_name(pinfo, portName.c_str());
data->vport = snd_seq_create_port(data->seq, pinfo);
if ( data->vport < 0 ) {
errorString_ = "RtMidiIn::openVirtualPort: ALSA error creating virtual port.";
error( RtError::DRIVER_ERROR );
}
}
if ( inputData_.doInput == false ) {
// Start the input queue
snd_seq_start_queue( data->seq, data->queue_id, NULL );
snd_seq_drain_output( data->seq );
// Start our MIDI input thread.
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
pthread_attr_setschedpolicy(&attr, SCHED_OTHER);
inputData_.doInput = true;
int err = pthread_create(&data->thread, &attr, alsaMidiHandler, &inputData_);
pthread_attr_destroy(&attr);
if (err) {
snd_seq_unsubscribe_port( data->seq, data->subscription );